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LMP91000 New Chemical Sensor Modelling

aale2025
Intellectual 785 points
Other Parts Discussed in Thread: LMP91000

Hello, I intend to use LMP91000 with a standard electrochemical cell with three electrodes with graphite working electrode, they may be used in most of analytical applications. Every serygraphed sensor is made by a 3 mm diameter circular graphite electrode and a pseudo-reference silver electrode and a graphite counter-electrode electrode.

I wonder how to obtain the electrical features to create a "New" Sensor in Webench.

Sensitivity (na/ppm) = 1      ; It's an amperometric application, I need to measure currents in the range 0 nA - 1000 nA

Full Range Scale (ppm) = 1000

Zero level (nA) = ?

Bias Voltage = 200 mV

Rload = ?

Capacitance = ?

Resistance = ?

The manufacturer EcoBioservices (http://www.ebsr.it/GSensor_eng.html), seems not to have these values...

Thank you !!!

Alejandro

  • 0
    TI__Genius 9655 points

    Hi Alejandro,

    there is the same problem for gas sensors (not all manufactures show those data).

    Anyway Capacitance and Resistance are used just to evaluate the performances of the system (sensor + LMP91000). If you do not put them in the GUI, the GUI is still able to configure the LMP91000.

    Regaridng the Zerlo Level (consider the sensor ideal) put it equal to 0nA.

    regards,

    Domenico

  • 0 in reply to domenyko
    Intellectual 785 points

    Hi Domenico !

    Thank you for your response.

    What about the Rload valued ?

    Thanks again,

    Alejandro

  • 0 in reply to aale2025
    TI__Genius 9655 points

    Hi Alejandro,

    the Rload of a potentiostat circuit has  a double feature:

    - set the BW of the system (with the outout cap of the sensor) & reduce the noise BW (as the Rload increases).

    Also in this case you can try which value gives the best results in terms of Noise/Settling time.

    In the GUI the Rload impacts on the BW and Noise performances calculation,

    regards,

    Domenico.